<!doctype html>
<html>
	<head>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-widht,initial-scale=1,mximum-scale=1,user-scalable=no">
		<title></title>
		<link rel="stylesheet" href="css/bootstrap.min.css">
	</head>
	<style>
		.row{
			border: 1px solid #ff0000;
		}
		[class*="col-"]{
			border: 1px solid #00ff00;
			padding-top: 15px;
			padding-bottom: 15px;
			background-color: #eee;
		}
		@media screen and (min-width: 768px){

		}
	</style>
	<body>
		<div class="container">
		 	<div class="row">
		 		<div class="col-md-1">1</div>
		 		<div class="col-md-1">2</div>
		 		<div class="col-md-1">3</div>
		 		<div class="col-md-1">4</div>
		 		<div class="col-md-1">5</div>
		 		<div class="col-md-1">6</div>
		 		<div class="col-md-1">7</div>
		 		<div class="col-md-1">8</div>
		 		<div class="col-md-1">9</div>
		 		<div class="col-md-1">10</div>
		 		<div class="col-md-1">11</div>
		 		<div class="col-md-1">12</div>
		 	</div>
		 	<div class="row">
		 		<div class="col-sm-4 col-md-8">111</div>
		 		<div class="col-sm-8 col-md-4">222</div>
		 	</div>		 	
		</div>
		<!-- clearfix 清除浮动的 -->
	</body>
</html>